#ifndef _DES_H_
#define _DES_H_

void des_file(char *input_file, char desKey[8], char *output_file, char mode);
void ByteToBit(char ch, unsigned char bit[8]);
void BitToByte(unsigned char bit[8], char *ch);
char *string_encode(const char *str, char desKey[8]);
char *string_decode(const char *str, char desKey[8]);

#endif
